Electrode for vapor-lamps.



P. U. HEWITT.

ELECTRODE FOR VAPOR LAMPS. APPLICATION FILED APR. 16, 1904.

Patented Aug. 2, 1910.

GOMPANY, 0F YUR'K, N. Y., A CORPORATION OF NEW YORK.

AT PATENT OFFICE.

PETER COOPER, HEWITT, OF NEW YORK, N. '21, ASSIGNOR TO COOPER HEWITT ELECTRIG ELECTRUDE FOR VAPOR-LAMPS.

fipecification or Letterslatent.

' Application filed April 1e, ulna. Serial No. 203,435.

To all whom i! may concern:

Be it known that l, PETER Coornn HEW- rrr, a citizen of the United States, and a resident of New York, in the county of New York and State of New York, have invented certain new and useful Improve ments in Electrodes for Vapor-Lamps, of which the following is a specification.

In a number of United States patents issued to me on the 17th day of September, 1901, I have shown and described electric lamps comprising, generally, a glass conminer and electrodes within the same, one of'the electrodes heingv in many instances a mass 'or puddle of mercury. The other electrode in lamps of this class may be either a body of solid material or it may be of mercury. In order to facilitate the transportation'of these lamps'without any unnecessary liability to breakage, I have devised as a substitute for one or both of the merc'ury electrodes, an electrode which is solid at normal tempertures, such solid electrode consisting of a suitable amalgam adapted to become more or less fluid when the lamp is in operation. I may employ two amalgam electrodes or a single amalgam electrode in combination with an electrode which remains solld, and in either case the lam containing such electrodes can be rea ily transported without the danger,

he used to suit specific cases.

7 less proper tions may be varied or other .llStlXtllI'GS may 1 l I have illustrated my invention in the 56-;

Patented Aug. "2, 1910-. i

the anode and cathode and are properly joined to the working circuit.

In Fig. 1, both the anode 2 and the cathode 5, are made up of an amalgam say of four parts mercury; one part lead; and one part tin; while in Fig. 2, the anode 2 is of pure iron and the cathode may be an amalgam such as just described. The .pro-

portions given are such as I have found well adapted to serve the purposes indicated. I desire, however, that these proportions may be considerably varied in practice as I do not wish to be limited to the exact proportions named, or the specific metals indicated as, cadmium, silver or other metals may be used to solidify or soak ,up the mercury.

In case of silver, it will soak up like a I claim asmy invention:-

An electrode for mercury vapor appa' ratus, consisting of an amalgam formed'of lead, tin and mercury in approximately the proportions of one part lead, one part tin, and four parts mercury.

Signed at New York, in the county of New York and State of New York, this 11th day of April, A. D. 1904.

PETER ooor R ,HEZWITT.

sponge, but always remain hard, not liquid.

Witnesses:

It. A. HEWITT, W'M. H. CAPEL. 

